user authenticate is not working Django

Question

user is not getting authenticated when i try to login.

this my register code

def register(request):
if request.method == "POST":
    username = request.POST["name"]
    email =  request.POST["email"]
    password = request.POST["password"]
    password2 = request.POST["password2"]

    try:
        if password2 != password:
            messages.error(request, "password did'nt match")
        elif User.objects.get(email=email):
            messages.error(request, "user already exists")
    except: 
        if email and username:
            user = User.objects.create_user(username=username, email=email)
            user.set_password(password)
            user.save()
            messages.success(request, "user created")
        else:
            messages.error(request, "Looks like user already exists")

return render(request, 'register.html', {})

this if my login code if i am using user.object.get for email and check_password for password it,s working but when i am using authenticate it,s not working . printing authenticate is returning None

def login(request):

    if request.method == "POST":
        email = request.POST["email"]
        password = request.POST["password"]
        print email
        print password
        try:
            user = authenticate(email=email , password=password)
            if user is not None:
                login(request, user)                    
                return redirect('dashbord')
            else:
                messages.error(request, "password yesn't match")

        except:

            messages.error(request, "login fail plz check ur password or email again")


    return render(request, 'login.html', {})

Answer 1

According to your comment, you are using default authentication system, but you authenticate with this line :

user = authenticate(email=email , password=password)

The fix, according to your question, is :
email = request.POST["email"]

username = request.POST["name"]
user = authenticate(username=username , password=password)

By default, django log with username, not with email (Cf : the documentation ).

For your question in the comment, it is a duplicate of Django - Login with Email. I invite you to find your solution in the accepted answer.